A batch of tablets (100,000) has normal distribution of their tablet weight with mean of 300 mg and standard deviation of 15. What is the number of tablets that have weights higher than 315 mg or lower than 285 mg (No need to use STAT tables, save time). O 32000 O 5000 O 16000 .2500 9500 6800

The distribution of heights in a population of women is approximately normal. Sixteen percent of the women have heights less than 62 inches. About 97.5% of the women have heights less than 71 inches. Use the empirical rule to estimate the mean and standard deviation of the heights in this population. Mean: K inches Standard Deviation: inches

The grades for 20 students on the most recent exam are given in the data table below. Round your answers to 2 decimal places as needed 46 71 41 94 50 47 85 86 98 72 82 40 47 80 44 89 61 66 81 96 Mean = Median = Standard deviation = Minimum score = Highest score =

Answer the question in the second photo with the data provided in the first photo

The table available below shows the costs per mile (in cents) for a sample of automobiles. At a = 0.01, can you conclude that at least one mean cost per mile is different from the others? Click on the icon to view the data table. Let Hss, µms, HLs, Hsuy and μMy represent the mean costs per mile for small sedans, medium sedans, large sedans, SUV 4WDs, and minivans respectively. What are the hypotheses for this test? A. Ho: Hss HMS HLS="SUV HMV H₂: Not all the means are equal. = B. Ho: Hss HMS = μLS="SUV = HMV Ha: Hss #HMS # μLS *μSUV HMV OC. Ho: Not all the means are equal. Ha: Hss HMS HLS HSUV HMV Ho: Hss #HMS HLS ‡μSUV * µMV Ha: Hss HMS = μLS="SUV=MV What is the test statistic? FSTAT (Round to two decimal places as needed.) =

The average American gets a haircut every 34 days. Is the average smaller for college students? The data below shows the results of a survey of 15 college students asking them how many days elapse between haircuts. Assume that the distribution of the population is normal. 35, 23, 32, 38, 31, 39, 35, 25, 30, 36, 40, 27, 23, 32, 25 What can be concluded at the the a = 0.10 level of significance level of significance? a. For this study, we should use Select an answer b. The null and alternative hypotheses would be: Ho: ?v Select an answerv Hi: ?vSelect an answerv c. The test statistic ?v = (please show your answer to 3 decimal places.) d. The p-value = (Please show your answer to 3 decimal places.) e. The p-value is 2v a f. Based on this, we should Select an answerv the null hypothesis. g. Thus, the final conclusion is that.. O The data suggest the population mean is not significantly lower than 34 at a = 0.10, so there M 24 3. 4. 5 6. 7 EU

Find the proportion of Normally distributed observations with a z-score above -1.93. Give your answer to four decimal places.

Use the Empirical Rule. The mean speed of a sample of vehicles along a stretch of highway is 68 miles per​ hour, with a standard deviation of 3 miles per hour. Estimate the percent of vehicles whose speeds are between 65 miles per hour and 71 miles per hour.​ (Assume the data set has a​ bell-shaped distribution.) Approximately nothing​% of vehicles travel between 65 miles per hour and 71 miles per hour.

Ms. Gonzalez has recorded the test scores for each of her 25 students, She has calculated EX? = 320 and (EX) = 5,000, Calculate the estimated population standard deviation for her data. 1.98 2.24 O 5.00 O 3.95

Find the proportion of Normally distributed observations with a zz-score above -1.94. Give your answer to four decimal places.